update README.md

MyKings · MyKings · commit fc0f30cdb06f · 2017-12-10T14:27:21.000+08:00
diff --git a/README.md b/README.md
@@ -2,6 +2,12 @@
 
 python-masscan is a python library which helps in using masscan port scanner. 
 
+## INSTALL
+
+```bash
+pip install python-masscan
+```
+
 ## USAGE
 
 ```python
